diff -r 123bd97fcea1 -r f2f480bc4223 src/Tools/jEdit/src/theories_dockable.scala
--- a/src/Tools/jEdit/src/theories_dockable.scala	Tue Mar 26 12:40:51 2013 +0100
+++ b/src/Tools/jEdit/src/theories_dockable.scala	Tue Mar 26 14:03:31 2013 +0100
@@ -93,7 +93,7 @@
             (st.failed, PIDE.options.color_value("error_color")))
 
           val size = peer.getSize()
-          val insets = border.getBorderInsets(this.peer)
+          val insets = border.getBorderInsets(peer)
           val w = size.width - insets.left - insets.right
           val h = size.height - insets.top - insets.bottom
           var end = size.width - insets.right